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   3William F. MahoneyChicago(312) 645-7806wmahoney@smsm.comwmahoney@smsm.comSegal McCambridge Singer & Mahoney Ltdwww.smsm.comwww.smsm.commahoneywilliam.jpgClass Action/Mass Tort Defense LawProducts Liability Defense LawToxic Torts Defense Law
William F. Mahoneywmahoney@smsm.com
Segal McCambridge Singer & Mahoney Ltdhttp://www.smsm.com
233 S Wacker Dr Ste 5500
Chicago IL 60606
Ph.(312) 645-7806 Fx.(312) 645-7711
Recommended by peers in:
Class Action/Mass Tort Defense Law
Products Liability Defense Law
Toxic Torts Defense Law
Advisory Board Member
County:  Cook
Litigator:  Yes

Practice Description:  
Recognized as both a Leading Lawyer by Law Bulletin Publishing Company and a Super Lawyer® by Thomson Reuters, William F. Mahoney has a national trial practice focused on toxic tort and environmental cases. He defends clients at trials in Illinois, Texas, Ohio, Wisconsin, Florida, Kansas, Louisiana, New York, Massachusetts, California, and Indiana and is the national trial counsel for defendants named in thousands of asbestos-related cases. Additionally, he has served as national coordinating counsel for several corporations in mass tort litigation. One of the founding members of Segal McCambridge Singer & Mahoney, his important legal work has helped the firm to grow exponentially from a tiny Chicago office to nearly 150 attorneys in seven cities.

Mr. Mahoney has been retained as counsel for defendants in state and federal class-action proceedings and has litigated successfully for the dismissal of class-action lawsuits involving cellular telephones (brain cancer) and radar guns (leukemia). He has substantial experience in electromagnetic field, chemical exposure, mold, benzene, mercury, and welding rod litigation.

Within the context of his toxic tort practice, Mr. Mahoney has developed special expertise in epidemiology, medical causation, toxicology, industrial hygiene, risk assessment, and biostatistics. He has been actively involved in constitutional challenges to tort reform statutes, arguing in defense of caps on non-economic and punitive damages, the repeal of joint and several liability and legislative changes affecting the product liability statutes of repose. Mr. Mahoney also has considerable experience defending general product liability, professional liability, construction, and insurance coverage matters.

Having served in a leadership position for Segal McCambridge in all 25 years of its existence, Mr. Mahoney has served as co-chair of the firm for the past seven.

In addition to his leadership role at the firm, Mr. Mahoney is active personally and professionally in his community, serving in a leadership role for both the Chicago Legal Clinic and the Chicago chapter of Human Rights Watch. He is furthermore a member of the Directors' Circle at the Chicago Counsel of Global Affairs and the Board of Trustees at Writer's Theatre, and he has been admitted to the Society of Fellows of the Aspen Institute. He resides in Chicago.


Notable Cases and Results:  
    • Segal McCambridge Singer & Mahoney, co-chairman
    • Segal McCambridge Singer & Mahoney Executive Committee
    • Appointed to Federal Asbestos Product Liability Litigation MDL 875 Joint Plaintiff/Defendant Steering Committee, 2006


Bar Admissions:  
Illinois, 1978
Michigan, 1997
Texas, 1998
U.S. District Court, Central District of Illinois, 1988
U.S. District Court, Northern District of Illinois, 1979
U.S. District Court, Southern District of Illinois, 1989
U.S. District Court, Northern District of Indiana, 1995
U.S. District Court, Eastern District of Wisconsin, 1993


Date of Birth:  1953

Law School:  University of Illinois, J.D., 1978

Undergraduate School:  Loyola University, B.A., 1975
Undergraduate School Honors/Involvement:  Cum laude; Honors Program; Alpha Sigma Nu National Jesuit Honor Fraternity; Blue Key Honor Fraternity

Bar/Professional Association Involvement:  
  • Human Rights Watch
    • Chicago Lawyers' Committee
  • Chicago Legal Clinic
    • Board of Directors
  • American Bar Association
    • Toxic and Hazardous Substances Committee
      • Vice-chair
  • American Bar Foundation
    • Fellow, 2002-present
    • "Investing in Justice" Campaign
      • Vice-chair
  • Chicago Bar Association
    • Special Committee on Evaluation of Judicial Candidates
  • Chicago Council of Lawyers
  • Defense Research Institute
  • Aspen Institute
    • Society of Fellows
    • Executive Leadership Program, 2005
    • Justice and Law Program, 2006
  • Chicago Council of Global Affairs
    • Directors' Circle


Awards; Honors; Distinctions:
      • Martindale-Hubbell AV® Peer Review Rating
      • Illinois Super Lawyer®
      • Leading Lawyers Member selected by peers in Class Action/Mass Tort Defense Law, Products Liability Defense Law, and Toxic Torts Defense Law


Community Involvement:  
  • Writer's Theatre
    • Board of Trustees
  • Arts Club of Chicago
  • Archbishop Quigley Seminary
    • Board of Advisers
      • President
  • Sacred Heart School Board
    • President


Published Legal Writing:  
  • "Asbestos Trust: Time for a Decision," Harris Martin's COLUMNS-Asbestos, Volume 5, Number 9, July 2005
  • Editorial advisory board, Pattern Voir Dire Questions by Susan Broome, Ph.D., James Publishing, 2011
  • Contributor, "Toxic and Hazardous Substances and Environmental Law," Annual Survey, Tort and Insurance Law Journal, 1992-1996


Lectures With Accompanying Papers:
  • "Class Action and Mass Torts: History and Recent Developments," Midwest Environmental Claims Association, 1997
  • "The Defense of Increased Risk and Fear of Cancer Claims," American Bar Association National Institute on Toxic Torts, 1992


Legal Lectures:  
  • Panelist, "Emerging Risks - The Perennial Contenders," Perrin Conferences' Emerging Risks On Dual Frontiers: Perspectives on Potential Liabilities in the New Decade, London, England, April 12-13, 2012
  • Presenter, "Emerging Trends in Asbestos Litigation - What To Expect in the Litigation in 2012," Cutting-Edge Issues in Asbestos Litigation, Perrin Conferences, Beverly Hills, CA, March 1-2, 2012
  • Presenter, "The Arab Spring, Human Rights, and International Law," Human Rights and a Just Society, Nicolaus Copernicus University, Torun, Poland, October 17, 2011
  • Panelist, "Asbestos Litigation in 2011 & Beyond - Current & Emerging Trends," Perrin Conferences' Cutting-Edge Issues in Asbestos Litigation, Beverly Hills, CA, March 3-4, 2011
  • Presenter, "Fiber Type and Mesothelioma Causation - Update on Epidemiology and Practice Tips on Developing the Exposure Profile," DRI's Asbestos Medicine Seminar, November 12-13, 2009
  • Presenter, "Genocide, Human Rights and International Justice: Past, Present and Future," Human Rights and a Just Society, Nicolaus Copernicus University, Torun, Poland, October 12, 2009
  • Panelist, "`Hot' Jurisdictions: California, Illinois, New York, Pennsylvania, and Texas," HB's National Asbestos Litigation Conference, September 24, 2009
  • Presenter, "Status of the National Litigations and a Look at Their Future," Mealey's Lead Litigation Conference, Orlando, FL, April 3-4, 2008
  • Presenter, "Across the Pond: The Similarities & Differences Between the U.S. and UK Legal Systems," Mealey's 3rd Annual International Asbestos Conference, London, England, October 17-18, 2007
  • Presenter, "Pre-eminent Lawyers - Superstars of Trial," Defense Research Institute, Chicago, IL, September 27-29, 2007
  • Presenter, "Opening Statements in the Low Dose Chrysotile Case," Asbestos Medicine Seminar, Defense Research Institute, Las Vegas, NV, October 2006
  • Presenter, "Catastrophic Damages and Corporate Conduct: A Defense Primer," Asbestos Medicine Seminar, Defense Research Institute, November 2004
  • Presenter, "Ten Corporate Mistakes Leading to Punitive Damages," Damages Seminar, Defense Research Institute, 2004
  • Presenter, "Confronting Environmental, Asbestos, Mold, and Other Organic Concerns," Insurance Coverage and Claims Institute, Defense Research Institute, 2004
  • Presenter, "Asbestos Litigation and Legislation," Insurance Coverage and Claims Institute, Defense Research Institute, 2003
  • Presenter, "Medical Defenses in Asbestos Litigation," Mealey's National Asbestos Conference, 2003
  • Presenter, "The Chrysotile Defense: Revisited," Asbestos Medicine Symposium, Defense Research Institute, 2001
  • Presenter, "Recent Appellate Developments in Asbestos Litigation," Mealey's National Asbestos Conference, 2000
  • Presenter, "Corporate Management of Toxic Tort Litigation," American Bar Association Annual Meeting, 1998
  • Presenter, "Essentials of Daubert in Practice: The Role of Expert Scientific Proof at Trial," American Bar Association Annual Meeting, 1997
  • Panelist, "Environmental Contamination, Litigation Strategies and Bankruptcy Considerations," American Bar Association Annual Meeting, 1996
  • Presenter, "The Case from Hell, Opening Statements for the Defendant in Toxic Tort Litigation," American Bar Association National Meeting, 1995


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